Optical ion sensing membrane for detecting pH and preparation method and application thereof

A technology for sensing membranes and ions, applied in the field of chemical detection, can solve the problems such as the inability to achieve continuous and repeated detection, and achieve the effect of high quantum yield

Inactive Publication Date: 2012-06-13
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, continuous and repeated detection is often not possible in homogeneous phases, but chemical sensors based on upconverting nanomaterials can meet these requirements as long as they are combined with suitable probes.

Method used

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  • Optical ion sensing membrane for detecting pH and preparation method and application thereof
  • Optical ion sensing membrane for detecting pH and preparation method and application thereof
  • Optical ion sensing membrane for detecting pH and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: NaYF 4 : Synthesis of Er, Yb Nanorods.

[0037] NaYF 4 : Er, Yb nanorods were synthesized according to literature 18 .

[0038] The specific steps are: sodium hydroxide (1.2g, 30mmol), water (7mL), ethanol (12mL) and oleic acid (22mL) are mixed together and stirred to form a transparent solution. Under non-stop magnetic stirring, add a total amount of 1mmol rare earth chloride (2mL in total, 0.5M, the doping ratio of rare earth ions is according to the molar ratio: 78mol%Y+20mol%Yb+2mol%Er) aqueous solution, after stirring evenly 5 mL of 1M sodium fluoride solution was added dropwise. Stir the mixed solutions for about 10 min, transfer them to a 50 mL hydrothermal reactor, package, and hydrothermally treat at 195 °C for 16 h. After natural cooling, dissolve and collect the sample with cyclohexane, add ethanol to precipitate the sample, centrifuge, wash several times with ethanol and water, and then vacuum dry.

[0039] From the SEM characterization resu...

Embodiment 2

[0040] Example 2: Preparation of an optical ion-sensing membrane for pH detection.

[0041] Each component is made into 100mg mixture according to the weight percentage as follows:

[0042] Chromogenic ionophore ETH5418 0.41%;

[0043] Ion exchanger NaTFPB 0.45%;

[0044] NaYF 4 : Er, Yb nanorods (made in embodiment 1) 2.13%;

[0045] PVC 33.13%;

[0046] Plasticizer DOS 63.88%.

[0047] The above mixture was dissolved with 1 mL of THF. The resulting solution was shaken vigorously for 0.5 h and then sonicated for at least 0.5 h to obtain a homogeneous solution. Use a pipette to take 50 μL of the mixed solution and apply it evenly on a clean rectangular quartz plate. Before use, let the solvent evaporate in the dark for 0.5 hours to obtain an optical ion sensing membrane for pH detection. The thickness of the membrane is 5-7 μm.

[0048] During the detection, insert the quartz plate with the optode film vertically into the quartz cuvette with slots, put it into the sampl...

Embodiment 3

[0052] Example 3: Preparation of an optical ion-sensing membrane for pH detection.

[0053] Each component is made into 100mg mixture according to the weight percentage as follows:

[0054] Chromogenic ionophore ETH5418 0.38%;

[0055] Ion exchanger NaTFPB 0.44%;

[0056] NaYF 4 : Er, Yb nanorods (made in Example 1) 2.09%;

[0057] With PVC 33.15%;

[0058] Plasticizer NPOE 63.94%.

[0059] The above mixture was dissolved with 1 mL of cyclohexanone. The resulting solution was shaken vigorously for 0.5 h and then sonicated for at least 0.5 h to obtain a homogeneous solution. Use a pipette to take 50 μL of the mixed solution and apply it evenly on the top of the optical fiber. Before use, let the solvent evaporate in the dark for 0.5 hours to obtain an optical ion sensing membrane for pH detection. The thickness of the membrane is 5-7 μm.

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Abstract

The invention discloses an optical ion sensing membrane for detecting the pH, which comprises the following components in percentage by weight: 0.38 percent to 0.42 percent of ETH5418; 0.44 percent to 0.49 percent of sodium quadri (3,5-bis(trifluoro methyl)phenyl)borate; 2.09 percent to 2.14 percent of up-conversion nanorod; 33.13 percent to 33.16 percent of polrvinyl chloride; and the balance ofdi(2-ethyl-hexyl)sebacate or o-nitrophenyl octyl ether or dioctyl phthalate for compensating to 100 percent. The invention also discloses a preparation method of the optical ion sensing membrane and application of the sensing membrane to the pH detection. The optical ion sensing membrane for detecting the pH, which is disclosed by the invention, is excited by light with wavelength of 980nm, the light is transmitted in a near infrared region as well, and the sensor cannot be interfered by background absorption and background fluorescence. Moreover, relative to a conventional organic system, the system, namely the optical ion sensing membrane, has higher quantum yield and can generate high-strength fluorescence.

Description

technical field [0001] The invention belongs to the technical field of chemical detection, and in particular relates to an optical ion sensing membrane for detecting pH, a preparation method and application thereof. Background technique [0002] The development of ion sensors with high selectivity and sensitivity for biological and environmental detection has attracted extensive interest in recent years. The detection of ions in biological systems plays a key role in the study of signal transmission in organisms, and the detection of highly toxic heavy metals in the environment also promotes the development of ion sensors. Optical sensors based on polymer materials have been applied to the detection of various ions in biological systems and environments, providing a reliable platform for ion sensing 1-7 . Commonly used optodes are used for sensing by ultraviolet absorption or changes in fluorescence intensity, among which fluorescence detection is often used in clinical de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/76G01N21/64
Inventor 秦玉谢亮霞
Owner NANJING UNIV
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